Prosecutors nationwide are on alert, taking extra precautions and watching for possible threats. The shooting of Texas prosecutors has local district attorneys worried.

"Prosecutors across this nation go into the courtroom, and they try to do justice and they try to do their job, and now it seems as though there's an assault on law enforcement officers throughout the nation," District Attorney Lemuel Martinez said.

The National District Attorneys Association issued an alert Monday reminding all prosecutors to be vigilant with respect to their personal safety, and to take appropriate steps if they receive any threats.

In Kaufmann County, Texas, an unknown gunman murdered Assistant District Attorney Mark Hasse outside the courthouse early this year. At the time, District Attorney Mike McLelland promised the killer he would find him, but McLelland was found dead in his home on Saturday.